Hardhat helmet



FIG. 1 is a perspective view of a hardhat helmet showing our new design;

FIG. 2 is a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIGS. 5 and 6 are side views thereof; and,

FIG. 7 is a rear view thereof. 

CLAIM The ornamental design for a hardhat helmet, as shown and described. 